And just to reiterate, in case people miss it on the left-hand sidebar there; the ebooks of Stealing Light and Nova War, as sold through www.panmacmillan.com, have no DRM. And that goes for all the ebooks sold by Pan Macmillan through their UK website.
If they're sold through third-party resellers like Waterstones, then they do have DRM, but that's imposed by those resellers, not Pan Mac or Tor. I've been getting occasional queries from people about where to find the ebooks, particularly from people outside the UK who are concerned they won't be able to purchase them due to geographical restrictions. To my knowledge, no one has had trouble buying my or anyone else's ebooks direct from the www.panmacmillan.com site, regardless of where they live.